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    <title>Document</title>
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    <title>Document</title>
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</head>

<body>
    <div class="div1">
        <input type="text" placeholder="0">
        <button class="butten1">清除</button>
        <div class="div2"> </div>
        <table class="butten2">
            <tr>
                <td>7</td>
                <td>8</td>
                <td>9</td>
            </tr>
            <tr>
                <td>4</td>
                <td>5</td>
                <td>6</td>
            </tr>
            <tr>
                <td>1</td>
                <td>2</td>
                <td>3</td>
            </tr>
            <tr>
                <td>0</td>
                <td>.</td>
                <td>=</td>
            </tr>
        </table>
        <table class="butten2">
            <tr>
                <td>+</td>
            </tr>
            <tr>
                <td>-</td>
            </tr>
            <tr>
                <td>*</td>
            </tr>
            <tr>
                <td>/</td>
            </tr>
        </table>
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